public class Demo {

    public static void main(String[] args) throws InterruptedException {


        Object lock1 = new Object();
        Object lock2 = new Object();
        Object lock3 = new Object();

        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 3; i++) {
                synchronized (lock1) {
                    try {
                        lock1.wait();
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }
                }
                System.out.print("A");

                synchronized (lock2) {
                    lock2.notify();
                }
            }


        });

        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 3; i++) {
                synchronized (lock2) {
                    try {
                        lock2.wait();
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }
                }
                System.out.print("B");

                synchronized (lock3) {
                    lock3.notify();
                }
            }


        });
        Thread t3 = new Thread(() -> {
            for (int i = 0; i < 3; i++) {
                synchronized (lock3) {
                    try {
                        lock3.wait();
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }
                }
                System.out.println("C");

                synchronized (lock1) {
                    lock1.notify();
                }
            }


        });

        t1.start();
        t2.start();
        t3.start();
        Thread.sleep(1000);

        synchronized (lock1) {
            lock1.notify();
        }
    }
}
